LOADING(Note a)PIN NAMESA0 – A3, B0 – B3IA = B
IA < B, IA > BOA > BOA < BOA = B
Parallel Inputs
A = B Expander Inputs
A < B, A > B, Expander InputsA Greater than B OutputB Greater than A OutputA Equal to B Output
HIGH1.5 U.L.1.5 U.L.0.5 U.L.10 U.L.10 U.L.10 U.L.
LOW0.75 U.L.0.75 U.L.0.25 U.L.5 U.L.5 U.L.5 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
10121315911141423
A0A1A2A3B0B1B2B3IA>BOA>BIAVCC = PIN 16GND = PIN 8
576
http://onsemi.com
2
元器件交易网www.cecb2b.comSN74LS85LOGIC DIAGRAM(15)(1)A3B3(5)(13)OA>B(14)(2)ABA1B1(12)(11)A2B2(6)OA=B(7)OAB3A3B2A2B1A1B0A0BXXXXXXXXHLXHLIABHLHLHLHLHLLLHOUTPUTSOA BOA < BOA = BBnB3OA > BOA < BOA = BA0A1A2A3B0B1B2IA > BIA < BIA = BLLHIA > BIA < BIA = BSN74LS85SN74LS85A > BA < BA = BL = LOW LEVELH = HIGH LEVELFigure 1. Comparing Two n-Bit WordsAPPLICATIONSFigure 2 shows a high speed method of comparing two24-bit words with only two levels of device delay. With thetechnique shown in Figure 1, six levels of device delay resultTable 1WORD LENGTH1–4 Bits5–24 Bits25–120 BitsNUMBER OF PKGS.12–68–31when comparing two 24-bit words. The parallel techniquecan be expanded to any number of bits, see Table 1.NOTE:The SN74LS85 can be used as a 5-bit comparator onlywhen the outputs are used to drive the A0–A3 and B0–B3inputs of another SN74LS85 as shown in Figure 2 in posi-tions #1, 2, 3, and 4.INPUTS(LSB)A0A1A2A3B0B1B2B3A0A1A2A3B0B1B2B3IA > BOA > BIA < B#5OA < BIA = BOA = B(MSB)A20A21A22A23B20B21B22B23A0A1A2A3B0B1B2B3IA > BOA > BIA < BIA = B#1OA < BOA = BNCLLHA19B19LINPUTSA5A6A7A8B5B6B7B8A0A1A2A3B0B1B2B3OA > B#4IA < BOA < BIA > BIA = BOA = BNCA10A11A12A13B10B11B12B13A0A1A2A3B0B1B2B3OA > B#3OA < BIA < BIA > BIA = BOA = BNCA15A16A17A18B15B16B17B18A0A1A2A3B0B1B2B3OA > B#2OA < BIA < BIA > BIA = BOA = BNCA4B4LA9B9LA14B14LA0A1A2A3B0B1B2B3IA > BOA > BIA < BIA = B#6OA < BOA = BOUTPUTSMSB = MOST SIGNIFICANT BITLSB = LEAST SIGNIFICANT BITL = LOW LEVELH = HIGH LEVELNC = NO CONNECTIONFigure 2. Comparison of Two 24-Bit Wordshttp://onsemi.com4元器件交易网www.cecb2b.comSN74LS85DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)LimitsSymbolVIHVILVIKVOHParameterInput HIGH VoltageInput LOW VoltageInput Clamp Diode VoltageOutput HIGH Voltage2.7–0.653.50.25VOLOOutputLOWVoltageOutput LOW VoltageInput HIGH CurrentA < B, A > BOther InputsA < B, A > BOther InputsIILIOSICCInput LOW CurrentA < B, A > BOther InputsOutput Short Circuit Current (Note 1)Power Supply Current–200.350.40.520600.10.3–0.4–1.2–10020Min2.00.8–1.5TypMaxUnitVVVVVVµATest ConditionsGuaranteed Input HIGH Voltage forAll InputsGuaranteed Input LOW Voltage forAll InputsVCC = MIN, IIN = –18 mAVCC = MIN, IOH = MAX, VIN = VIHor VIL per Truth TableIOL = 4.0 mAIOL = 8.0 mAVCC = VCC MIN,VIN = V=VIL or VorVIHper Truth TableVCC = MAX, VIN = 2.7 VIIHmAVCC = MAX, VIN = 7.0 VmAmAmAVCC = MAX, VIN = 0.4 VVCC = MAXVCC = MAXNote 1: Not more than one output should be shorted at a time, nor for more than 1 second.AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)LimitsSymboltPLHtPHLtPLHtPHLtPLHtPHLtPLHtPHLtPLHtPHLParameterAny A or B to A < B, A > BAny A or B to A = BA < B or A = B to A > BA = B to A = BA > B or A = B to A < BMinTyp24202723141113131411Max36304545221720262217UnitnsnsnsnsnsVCC = 5.0 VCL = 15 pFTest ConditionsAC WAVEFORMSVIN1.3 VtPHL1.3 VtPLH1.3 VVIN1.3 VtPHL1.3 VtPLH1.3 VVOUT1.3 VVOUT1.3 VFigure 3. Figure 4. http://onsemi.com5元器件交易网www.cecb2b.comSN74LS85PACKAGE DIMENSIONSN SUFFIXPLASTIC PACKAGECASE 648–08ISSUE R–A–169NOTES:1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.DIMENSION L TO CENTER OF LEADS WHENFORMED PARALLEL.4.DIMENSION B DOES NOT INCLUDE MOLD FLASH.5.ROUNDED CORNERS OPTIONAL.DIMABCDFGHJKLMSINCHESMILLIMETERSMINMAXMINMAX0.7400.77018.8019.550.2500.2706.356.850.1450.1753.694.440.0150.0210.390.530.0400.701.021.770.100 BSC2.54 BSC0.050 BSC1.27 BSC0.0080.0150.210.380.1100.1302.803.300.2950.3057.507.740 10 0 10 ____0.0200.0400.511.01B18FSCL–T–HKGD16 PLSEATINGPLANEJTAMM0.25 (0.010)Mhttp://onsemi.com6元器件交易网www.cecb2b.comSN74LS85PACKAGE DIMENSIONSD SUFFIXPLASTIC SOIC PACKAGECASE 751B–05ISSUE J–A–NOTES:1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.2.CONTROLLING DIMENSION: MILLIMETER.3.DIMENSIONS A AND B DO NOT INCLUDEMOLD PROTRUSION.4.MAXIMUM MOLD PROTRUSION 0.15 (0.006)PER SIDE.5.DIMENSION D DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE DAMBARPROTRUSION SHALL BE 0.127 (0.005) TOTALIN EXCESS OF THE D DIMENSION ATMAXIMUM MATERIAL CONDITION.MILLIMETERSINCHESMINMAXMINMAX9.8010.000.3860.3933.804.000.1500.1571.351.750.0540.0680.350.490.0140.0190.401.250.0160.0491.27 BSC0.050 BSC0.190.250.0080.0090.100.250.0040.0090 7 0 7 ____5.806.200.2290.2440.250.500.0100.019169–B–18P8 PL0.25 (0.010)MBSGFKC–T–SEATINGPLANERX 45_MD16 PLMJ0.25 (0.010)TBSASDIMABCDFGJKMPRhttp://onsemi.com7元器件交易网www.cecb2b.comSN74LS85
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changeswithout further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particularpurpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/orspecifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must bevalidated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applicationsintended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury ordeath may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and holdSCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonableattorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claimalleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
ASIA/PACIFIC: LDC for ON Semiconductor – Asia Support
Phone:303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time)
Toll Free from Hong Kong 800–4422–3781
Email: ONlit–asia@hibbertco.com
JAPAN: ON Semiconductor, Japan Customer Focus Center
4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–8549Phone: 81–3–5487–8345Email: r14153@onsemi.com
Fax Response Line:303–675–2167
800–344–3810 Toll Free USA/CanadaON Semiconductor Website: http://onsemi.comFor additional information, please contact your localSales Representative.http://onsemi.com8SN74LS85/D